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Retirement and Post-Retirement Benefit Plan - Lump sum program (Narrative) (Details)
plan_participant in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
plan_participant
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan settlement (charges) credits   $ (179) $ 57 $ 0
Lump sum program        
Defined Benefit Plan Disclosure [Line Items]        
Number of plan participants elected to receive lump sum payments | plan_participant   16    
Lump sum payments to participants   $ 977 826  
Defined benefit plan settlement (charges) credits $ (177)   $ 79  
Percentage of eligible participants who elected to receive benefits     50.00%  
Net periodic benefit cost     $ 20